compiler-rt/test/fuzzer/ShrinkControlFlowTest.cpp

   1 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   2 // See https://llvm.org/LICENSE.txt for license information.
   3 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   4
   5 // Test that we can find the minimal item in the corpus (3 bytes: "FUZ").
   6 #include <cstddef>
   7 #include <cstdint>
   8 #include <cstdio>
   9 #include <cstdlib>
  10 #include <cstring>
  11
  12 static volatile int Sink;
  13
  14 void Foo() {
  15   Sink++;
  16 }
  17
  18 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  19   int8_t Ids[256];
  20   memset(Ids, -1, sizeof(Ids));
  21   for (size_t i = 0; i < Size; i++)
  22     if (Ids[Data[i]] == -1)
  23       Ids[Data[i]] = i;
  24   int F = Ids[(unsigned char)'F'];
  25   int U = Ids[(unsigned char)'U'];
  26   int Z = Ids[(unsigned char)'Z'];
  27   if (F >= 0 && U > F && Z > U) {
  28     Foo();
  29   }
  30   return 0;
  31 }
  32